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Hitachi says its HeatForce technology keeps 100% of heating capacity down to -15°C (5°F), and that the airHome 600 heats continuously down to -25°C. At Montréal-Trudeau, the January average low is -14.04°C. We checked the claim against the figures of every size, including the 15,000 BTU/h, a size only the 600 offers among our Hitachi wall units.
R-32Percentage: maximum at -15°C (Hitachi and NEEP agree) divided by the rated heating output in Hitachi’s brochure.
Each product page gives the AHRI number, the certified figures and the LogisVert amount of the size.
Tap a basis: each bar compares the maximum heat at -15°C, the same at Hitachi and NEEP, with a reference output. Hitachi’s brochure gives one; the NEEP certificate gives another, lower one.
The vertical line marks 100%. In red: under 100%.
The vertical line marks 100%. In red: under 100%.
Hitachi does not state the basis of its “100%”. Against the rated heating output in its own brochure, the 9,000, the 12,000 and the 18,000 hold 100%; the 24,000 reaches 98% and the 15,000, 83%. Against the rated capacity NEEP certifies at 8.3°C, all five meet or exceed 100%. At -15°C, NEEP certifies up to 14,500 BTU/h for the 12,000, the same as Hitachi’s published rated heating output.
The -15°C percentage uses the brochure basis. Where the brochure and the certificate differ on heat at -8.3°C, we print the certificate, the one Hydro-Québec reads, and the brochure in brackets.
ENERGY STAR Cold Climate and Most Efficient (US market), but under LogisVert’s 12,000 BTU/h nominal minimum.
See the product
The only 15,000 BTU/h size among our Hitachi wall units.
See the product
The highest output at -25°C in the series, and the only one that dehumidifies up to 4.0 L/h.
See the productFive sizes, five temperatures. At -25°C, the 24,000 still gives 15,000 BTU/h, twice the 9,000.
| Size | 8.3°C | -8.3°C | -15°C | -20°C (brochure) | -25°C |
|---|---|---|---|---|---|
| 9,000 BTU/h | 15,000 | 13,000 | 11,000 | 9,000 | 7,200 COP 1.57 |
| 12,000 BTU/h | 18,000 | 16,800 | 14,500 | 11,200 | 8,800 COP 1.52 |
| 15,000 BTU/h | 19,000 | 16,600 | 15,000 | 13,400 | 10,500 COP 1.66 |
| 18,000 BTU/h | 26,000 | 25,800 | 21,600 | 17,200 | 12,900 COP 1.72 |
| 24,000 BTU/h | 29,500 | 28,700 | 24,700 | 20,000 | 15,000 COP 1.69 |
Maximum output in BTU/h. 8.3, -8.3, -15 and -25°C: NEEP records by AHRI number (re-checked Oct. 28, 2026), identical to the brochure where it publishes the point; -20°C: Hitachi brochure only. The darker the cell, the higher the heat.
Every winter month, Montréal-Trudeau’s average low stays above -15°C. Below that mark, the airHome 600 heats continuously down to -25°C per its brochure. The normals have no -25°C threshold: those nights number between 0.27 and 14.26 a year.
Average daily low, 1981-2010
Montréal-Trudeau, ECCC. The vertical line marks -15°C, Hitachi’s claimed “100%” threshold. The pairing is ours.
In the brochure’s table, the base pan heater is standard. The brochure pairs it with “Adaptive Defrost technology with base pan heater: more effective defrosting in cold climates.” A snow protection accessory is available; Hitachi does not publish its part number.
Among our 15 Hitachi wall units, the only 15,000 is an airHome 600. It keeps the 12,000’s indoor cabinet, but not its outdoor unit or its line limits. And it is the size where the “100%” claim drops to 83% on the brochure’s figures.
Certified heat at -8.3°C: 12,600 BTU/h, hence $1,512 in LogisVert (12.6 × $120 = $1,512). The 12,000 gets $1,128, the 18,000, $1,800.
Indoor unit of 950 × 294 × 230 mm and 11 kg, like the 12,000. The outdoor unit grows: 850 × 800 × 298 mm and 47 kg, against 850 × 650 × 298 mm for the 12,000.
The installation manual limits the height difference to 15 m, the brochure to 20 m: we apply the stricter limit, the manual’s. 1/4 and 1/2 in. lines, MCA 16 A, MOP 25 A.
HSPF2 Region V: 8.5 per the brochure, 8.3 per NEEP. Indoor sound at HH: 48 dB(A) per the brochure, 47 per one table of the technical catalogue.
“Cool, HeatForce, Purify”: Hitachi Canada sums up the airHome 600 in three words. Run the cycle to see the order of the steps, then read about the rest of the equipment.
FrostWash 3.0, Canadian airHome 600 page. Kitasato Research Center tests no. 2020_0650 and 2020_0201, run on test model RAS-X22K, not on an airHome 600.
Then FrostWash cleans the outdoor unit’s coil, according to Hitachi Canada.
Activated carbon filter and stainless-steel pre-filter. JEM1467 test on an RAS-VJ24CLT, 25 m³ room, 300 minutes.
The coil rises to 50°C (122°F) to dry; the function can be turned off with the remote.
The presence sensor keeps the setting 20 minutes after you leave, then switches to Eco mode; auto-off is an option.
airCloud Go app: weekly schedule, energy cost, Smart-Fence, Alexa and Google Home.
The operation manual asks for it so as not to waste energy, and leaves the rest of the maintenance to a professional.
Pick a size and a speed: the needle follows the table in Hitachi’s brochure.
Indoor sound pressure from Hitachi’s table, SL (silent mode) to HH, identical in cooling and heating. Outdoor unit at high speed: 51 dB(A) (9,000), 52 (12,000 and 15,000), 53 cooling and 54 heating (18,000 and 24,000). Measured in an anechoic chamber.
The table gives the line limits, then the footprints in millimetres or inches: tap to switch units. R-32 refrigerant is classed A2L; Hitachi gives installers an R-32 calculation tool (A2L requirements).
| Size | Liquid – gas lines | Max. length | Max. height difference | MCA · MOP |
|---|---|---|---|---|
| 9,000 BTU/h | 1/4 – 3/8 in. | 25 m | 15 m | 12 A · 15 A |
| 12,000 BTU/h | 1/4 – 3/8 in. | 25 m | 15 m | 14 A · 15 A |
| 15,000 BTU/h | 1/4 – 1/2 in. | 30 m | 15 m (manual; brochure: 20 m) | 16 A · 25 A |
| 18,000 BTU/h | 1/4 – 1/2 in. | 30 m | 20 m | 20 A · 25 A |
| 24,000 BTU/h | 1/4 – 5/8 in. | 30 m | 20 m | 20 A · 25 A |
Hitachi brochures and installation manuals. For the 9,000, 12,000 and 15,000: minimum length 3 m, factory charge sufficient up to 15 m, then 10 g of R-32 per metre.
| Size | Indoor unit | Outdoor unit | Net weight, indoor · outdoor |
|---|---|---|---|
| 9,000 BTU/h | 950 × 294 × 235 mm | 750 × 570 × 280 mm | 11 kg · 34 kg |
| 12,000 BTU/h | 950 × 294 × 230 mm | 850 × 650 × 298 mm | 11 kg · 41 kg |
| 15,000 BTU/h | 950 × 294 × 230 mm | 850 × 800 × 298 mm | 11 kg · 47 kg |
| 18,000 BTU/h | 1,050 × 294 × 255 mm | 945 × 950 × 370 mm | 14 kg · 74 kg |
| 24,000 BTU/h | 1,100 × 300 × 260 mm | 945 × 950 × 370 mm | 15 kg (catalogue: 14 kg) · 74 kg |
Width × height × depth, Hitachi brochure.
18,000 clearances: 50 mm above, 100 mm left and right, and 1,500 mm from a fire alarm. 65 mm hole, sloping outward.
In cold areas, at least 250 mm between the drain hole and the ground. At least 1 m from antennas, three open sides.
With at least 3 mm contact separation, and a dedicated fuse or breaker, per the manuals.
Hitachi lists ten serviceability features (left or right drain, removable pan…). Some do not apply to the 24,000, Hitachi notes.
All five sizes are “cold climate” and Most Efficient in the ENERGY STAR list (US market). Hydro-Québec works from the certified heat: 9,400 BTU/h for the 12,000, not the brochure’s 9,800 BTU/h.
Math: heat certified at -8°C, in thousands of BTU/h, × $120. The 9,000 is under the 12,000 BTU/h nominal minimum. Hydro-Québec: list read Oct. 14, 2026, amounts recomputed Oct. 28, 2026 from the certificates. Full LogisVert rules (eligibility, deadlines, documents): our LogisVert page.
A brick building’s balcony, two rooftops, a narrow backyard: here is every published place, from Châteauguay to Oka, and three installations in pictures.
Places from the titles of our projects blog articles published as of Oct. 28, 2026: city or borough only. Grouping by territory: ours.
It is Hitachi’s claim for its HeatForce technology: heating capacity holds down to 5°F (-15°C). Hitachi does not state the basis. Per its brochure, the 9,000, 12,000 and 18,000 hold 100%; the 24,000, 98%; the 15,000, 83%.
Continuously down to -25°C, per the brochure and the operation manual. NEEP certifies that point: 7,200 BTU/h to 15,000 BTU/h at most depending on the size, with a COP of 1.52 to 1.72.
When the 12,000 is too tight and the 18,000 too big: we measure that during the visit. It gets $1,512 in LogisVert and it is the only 15,000 among our Hitachi wall units.
Yes. The airCloud adapter is included and unlocks the airCloud Go app.
Yes, over 5 wires. Hitachi notes it does not enable Smart Eco or the airHome 600’s other advanced features, FrostWash included.
The airHome 650 is the RAK-GJ…QHAA multi-zone wall head, a separate product that connects to an airHome Multi compressor. The airHome 600 is a single-zone system. See the multi-zone systems.
No. It is listed as Cold Climate and Most Efficient in the ENERGY STAR list (US market), but LogisVert requires an outdoor unit of at least 12,000 BTU/h nominal.
Hitachi and AirGreen warranties: explained once for the whole brand, on the HITACHI page.
No question matches. Call us at 514 316-2973.
We measure the room and the line set route, then write the size, the AHRI number and the indicative LogisVert amount on the quotation.
Hydro-Québec never solicits anyone by phone or door to door for LogisVert. If someone calls “on behalf of Hydro-Québec” to sell you a heat pump, hang up.
Monday to Thursday 8 a.m. to 6 p.m. · Friday 8 a.m. to 4 p.m.
×LogisVert amounts are indicative: the invoice must show the AHRI or ENERGY STAR number, and Hydro-Québec confirms eligibility and the amount when it processes the claim. Price on quotation.
